Well, to be honest? This guy took me about 3 hours to design and print from concept to product. I've always just naturally worked fast when I get sucked into a project. I consider everything I work on to be practice though.

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Tinkercad is an easy, browser-based 3D design and modeling tool for all. Tinkercad is also your perfect 3d printing companion – it allows you to imagine anything, and then design it in minutes! Tinkercad is part of the 123D family of free apps.